Hey there,
After reviewing your project description its clear that you are having some issue when synconysing your outlook mailboxes with the email server.
I'm very experienced with System Administration, Network Administration, SMTP Server Configuration and Troubleshooting, SMTP Authentication(SPF, Dkim, Dmarc, rDNS), SMTP IP Rotation, SMTP IP/Domain Reputation, Office365, Outlook Setup, Email Marketing, Email Handling.
I'll be happy to help you with this.
Thanks in advance for giving the opportunity to working with you.
Have a good day.
Best Regards,
Serazum Munir.